Eljsha clark



NE STATES PATENT FFICE.

ELisHA CLARK, or NEW YORK, N. Y.

COPYING-PRESS.

A Specification of Letters Patent No. 30,959, dated December 18, 1860.

To all whom it may concern:

Be it known that I, ELISHA CLARK, of the city, county, and State of NewYork, have invented a new and useful Improvement in Copying-Presses; andI do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawing, making a part of this specification, in which- Figure l is aninverted plan with the bridge piece p, and portions of the hangers li,and legs J, removed'. F ig. 2 is a. vertical section through the partsas indicated by the red angle line o, in Fig. l.

Similar letters of reference in both figures, indicate correspondingparts.

To enable those skilled in the art to make and use my invention I willproceed to describe its construction and operation, having reference tothe accompanying drawing.

The apparatus is supported on four legs or posts J, which are madehollow, as seen in Fig. 2, for the reception of the connecting rods f,and the springs s, with which each of the said rods f, are provided.

The legs are bored out from the lower end, with a larger auger than theupper end, which forms the shoulder a, near the top of the legs, whichacts as a seat for the upper end of the springs s, to rest against. rIhesprings should be coiled from the best steel The rods f, are eachprovided with a head g, at the-lower end, and they pass up throughwithin the coil of the springs s, through the bed plates B, and B, andreceive the caps cl, on their upper end which may be screwed on, or theymay be secured by the pins o.

The screw S, which is double threaded, so as to act rapidly is madesquare at the upper end, and is inserted Vin a corresponding shapedmortise in the bed plate B, which prevents it from turning when thescrew wheel is revolved. The said screw S, is supported by the hangersit, and bridge piece p, which are suspended from the under side of theprimary bed plate B, to which they are secured by screws.

The screw wheel D, is rigidly tiXed to the nut F, and upon the upperface of the said nut, the anti ressure bridge C, rests. This bridge C,is 'tted at each end to the vertical ways c, on the side of the hangersii, as seen in Fig. l, and is provided with four studs or pins a, whichproject through the bed plate B, and against the secondary or movablebed-plate B.

By turning the screw wheel D, in the proper direction, the antipressurebridge C, with its studs a, is made to rise which also elevates the bedplate B', at the same time compressing the spring s. The copy book maythen be placed between the two bed plates B, and B, and the screw wheelturned back so as to allow the springs s, to act upon the book withtheir full torce. The said book is relieved by running the screw wheelD, up the screw again, when it may be taken out and placed upon theupper, or movable bed plate, for examination and reference.

I propose to use marble or other suitable material for the beds B, B.

`What I claim as new and desire to secure by Letters Patent, is-

The arrangement of the antipressure bridge C, studs a screw S and nut Fwith the plates B B, rods f and springs s in the manner and for thepurpose herein shown and described.

ELISHA CLARK.

Witnesses:

M. M. LIVINGSTON, G. W. REED.

